Daimajuu Gekitou: Hagane no Oni

In the year 1999, a team of UN scientists in an attempt to tap into a new energy resource on a deserted island called Sansara, unknownigly open a portal to another universe, unleashing dormant biomechanical entities. Three years later, Takuya Goroza returns to the island of Sansara urged by a mysterious request by college chum Haruka Alford. Little does he know, his old friend isn't what he appears to be... (Source: ANN)

Type: OVA
Rating: PG-13 - Teens 13 or older
Season: None None
Status: Finished Airing
Read more: MyAnimeList (MAL)
Studios: AIC
Genres: Sci-Fi Horror
Tags: action sci fi sci-fi science fiction mecha military earth future horror piloted robot ships